How many of your scenarios are not very situational? Festergut and Sindragosa?
Problem found. You should want it, no matter what. Dispersion has always been in the "do i really want it?"-category.If you don't want it, nobody is forcing you to take it.
It is nice to have, but we just picked it because we had enough points for it.
But we're going around in circles: Dispersion has always been a biased spell. Some people love it, some people hate it, some people think it's just not worth the 31-point talent.